forces 2 ( distance velocity)

Question 1

what is distance?

Answer 1

how far an object moves
scaler quantity

Question 2

what is displacement?

Answer 2

displacement includes both the distance an object moves in a straight line from an objects starting point to its finishing point.

Question 3

what quantity is speed?

Answer 3

scaler

Question 4

what is speed?

Answer 4

how fast you are going and it does not involve direction

Question 5

why is being at a constant speed rare?

Answer 5

this is because speed is constantly changing when you run or walk

Question 6

what factors effect the speed at which a person walks at?

Answer 6

terrain, fitness, distance travelled

Question 7

what is velocity?

Answer 7

speed in a given direction

Question 8

how can objects travel at a constant speed with changing velocity?

Answer 8

this is when object is changing directions whilst staying at the same speed.

Question 9

what are the typical averages for people walking, running and cycling?

Answer 9

walking - 1.5m/s
running - 3m/s
cycling - 6m/s

Question 10

how can you calculate distance travelled at a constant speed?

Answer 10

using a ruler and stopwatch use the formula: distance travelled = speed x time

Question 11

what are the typical values for a car, train, plane

Answer 11

car- 25m/s
train-55m/s
plane-250m/s

Question 12

it is not only the speed that varies but what else? why?

Answer 12

sound 330m/s in air which changes depending on what soundwave travels through

Question 13

what is the wind speed affected by?

Answer 13

temperature, atmospheric pressure, large building or structures near by

Question 14

typical speed of sound in the air?

Answer 14

330m/s

Question 15

explain the speed and velocity of objects which move in a circle

Answer 15

the motion in a circle involves constant speed and constantly changing velocity because it is always changing directions.

Question 16

what is the definition of acceleration?

Answer 16

acceleration is the rate of change in velocity

Question 17

how can you find average acceleration?

Answer 17

acceleration = change in velocity / time

Question 18

how can speed of an object be calculate in a distance time graph?

Answer 18

from the gradient

Question 19

what is deceleration?

Answer 19

a negative acceleration but in speed time graphs only not distance time graphs

Question 20

what is uniform acceleration?

Answer 20

constant acceleration

Question 21

what happens to an object which falls through a fluid?

Answer 21

this object will start to accelerate due to the force of gravity and eventually resultant force will be zero and object will move at terminal velocity

Question 22

what is the equation for constant acceleration?

Answer 22

final velocity^2- initial velocity^2 = 2 x acceleration x distance

Question 23

in a distance time graph what does the flat sections mean?

Answer 23

object is stationary - stopped

Question 24

in a distance time graph what does the straight uphil lines mean?

Answer 24

travelling at a constant speed

Question 25

in a distance time graph what does the curve represent?

Answer 25

acceleration or deceleration

Question 26

in a distance time graph what does the steepening curves mean?

Answer 26

the objects speeding up

Question 27

in a distance time graph what does it mean a curve is leveling off

Answer 27

slowing down

Question 28

what does gradient mean of a velocity time graph?

Answer 28

acceleration

Question 29

what does the flat line mean in velocity time graphs?

Answer 29

steady speed

Question 30

what does uphil sections mean in a velocity time graph?

Answer 30

accelerating , downhil means decelrating

Question 31

what does a curve mean in a velocity time graph?

Answer 31

changing acceleration

Question 32

what does the area under the graph of a velocity time graph represent?

Answer 32

distance travelled in the time interval

Question 33

how can you find the gradient in a distance time graph

Answer 33

gradient= distance travelled/ time taken

Question 34

if in a distance time graph the object is changing speed and there is a curve how can you find the speed at a point?

Answer 34

draw a tangent on that point